Ismael Juma created KAFKA-2348:
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             Summary: Drop support for Scala 2.9
                 Key: KAFKA-2348
                 URL: https://issues.apache.org/jira/browse/KAFKA-2348
             Project: Kafka
          Issue Type: Task
            Reporter: Ismael Juma
            Assignee: Ismael Juma


Summary of why we should drop Scala 2.9:

* Doubles the number of builds required from 2 to 4 (2.9.1 and 2.9.2 are not 
binary compatible).
* Code has been committed to trunk that doesn't build with Scala 2.9 weeks ago 
and no-one seems to have noticed or cared (well, I filed 
https://issues.apache.org/jira/browse/KAFKA-2325). Can we really support a 
version if we don't test it?
* New clients library is written in Java and won't be affected. It also has 
received a lot of work and it's much improved since the last release.
* It was released 4 years ago, it has been unsupported for a long time and most 
projects have dropped support for it (for example, we use a different version 
of ScalaTest for Scala 2.9)
* Scala 2.10 introduced Futures and a few useful features like String 
interpolation and value classes.
* Doesn't work with Java 8 (https://issues.apache.org/jira/browse/KAFKA-2203).

Vote thread: http://search-hadoop.com/m/uyzND1DIE422mz94I1



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